/Engine/Source/Editor/UnrealEd/Public/Kismet2/KismetEditorUtilities.h
Unloads the specified Blueprint (marking it pending-kill, and removing it from its outer package). Then proceeds to replace all references with a copy of the one passed.
The duplicated replacement Blueprint.
static [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * ReplaceBlueprint ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Target, [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) const * Replacement )